/*
moxl - Modular XML Library
Copyright (c) 2007, Malcolm Sparks

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package moxl.xpath.axes;

import moxl.dom.MoxlElement;
import moxl.dom.MoxlNode;
import moxl.xpath.parser.types.NodeTestMatcher;

public class ChildAxisStrategy implements XPathAxisStrategy
{
	private final XPathAxis axis;

	public ChildAxisStrategy(XPathAxis axis)
    {
		this.axis = axis;
    }

	public Iterable<MoxlNode> getNodes(MoxlNode contextNode, NodeTestMatcher nodeTestMatcher) throws InvalidAxisForNodeException
	{
		if (contextNode instanceof MoxlElement)
		{
			return iterateChildrenMatchingNodeTest((MoxlElement) contextNode, nodeTestMatcher);
		}
		else
		{
			throw new InvalidAxisForNodeException(axis, contextNode);
		}
	}

	private Iterable<MoxlNode> iterateChildrenMatchingNodeTest(MoxlElement contextElement, NodeTestMatcher nodeTestMatcher)
	{
		return new XmlNodeListIterable(contextElement.getChildren().iterator(), nodeTestMatcher);
	}

}
